Considering how many people seem to think that $1500 is too much money for an AR-180B why are we even talking about having a company make a steel or aluminum lower? If you don't like the $1400-$1800 price they sell for used how many of you would actually pony up another $400-$600 for a new lower? That's exactly why no manufacturers have gone ahead and made one for us here in Canada. And with all the negative comments about NEA in other threads do you think they want to risk making something just to have people say they wouldn't pay over $100 for something made by NEA?
I don't want to risk having the RCMP revisit the classification of the rifle just to fix a problem that isn't there. Armalite had one batch of AR180B rifles with bad polymer and those rifles were replaced by Armalite under warranty. The rest are fine and as long as you don't abuse the rifle you should never have problems with the lower cracking. It's no different than an AR in that regard, there is very little stress on the lower during firing and the damage is done when people release the latch between the upper and lower and allow the upper to swing open and slam against the lower or practice their operator rolls in the living room and land on the rifle. Even an AR will break if you do that a few times so just enjoy your rifle if you have one and sleep easy knowing that if you do break it you can order the Stormwerkz repair kit
http://stormwerkz.com/accessories/armalite-ar-180b-pivot-repair-section/
This is just another case of the internet making a problem to fix that was never there to begin with. One or two problem rifles is no different than any other brand or type of rifle. They can't all be perfect.
I love my AR180B-2, it's light, reliable and plenty accurate for field use. Sure there are better rifles out there but you'll have to spend another $500-$1500 to get one. Hack it up to install a stock adapter and an AR stock and put on the MI quadrail and in my opinion you've ruined a perfectly good rifle and reduced it's value by half.